Digital pediatric radiology

Gindl, K.

doi:10.1007/978-3-7091-3707-9_24

Cited by 1 publication

(1 citation statement)

References 34 publications

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“…Resin MF merupakan resin amino dan tidak beracun bila digunakan di bawah suhu 100°C, karena formaldehida dalam resin MF akan menguap di atas suhu tersebut [19]. Selain itu resin MF lebih murah dari pada resin PF, memiliki kekerasan dan kekakuan tinggi dan sifat ketahanan air lebih tinggi daripada UF [20,21].…”

Section: Latar Belakangunclassified

Perluasan Kinerja Akustik Limbah Kayu Batang Kelapa Sawit Termodifikasi Bahan Formaldehida

Manik

Shaliha²,

Siregar³

et al. 2022

Positron

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Chemical modifications for waste oil palm trunks had carried out as acoustic material. This modification was conducted in two stages. Firstly, formalization with formaldehyde solution and secondly is impregnation with melamine-formaldehyde resin. Formalization was conducted in alkaline condition (pH 10) for 3 days and 5 days. Impregnation was carried out under pressure 3 bar and 5 bar and held for an hour. For completed these modification, the samples was cured at 120oC for 10 minutes and then dried at (103±2)oC to reached moisture content of less than 6%. This modification has changed the chemical structure and the morphology of wood, as shown by the FTIR and SEM results. The samples became denser, stronger and more rigid. Furthermore, the mechanical and physical properties of modified wood are also increasing. The absorption coefficient decreases with increasing formalization time and impregnation pressure. Based on trend of absorption coefficient, BKS wood can be applicated as resonant absorber with work class from A to class B and D.

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Section: Latar Belakangunclassified